The Earth

As, for example, the matter in the intestines of animals; how often and how powerfully is this matter used, and yet, although it is apparently only weak, it continues indestructibly for a considerable time in spite of those important expressions of force. If you further consider the much more delicate organs in the birds, in which even stones are ground and consumed, it must become still clearer to you how it depends there solely on a certain quality of the matter, according to which it is firm enough to let the forces developed in it work without damage in itself. – The Earth, Chapter 2, Paragraph 9

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